TAZ Very loose Solid rod bearings?

A forum dedicated to the stock LulzBot TAZ 3D Printer
Alup
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Joined: Wed Mar 05, 2014 11:29 pm

Re: TAZ Very loose Solid rod bearings?

Post by Alup » Sat Mar 08, 2014 8:32 pm

tmoore wrote:88HRB converts to an Rc of 9.

In other words... Do not use ball bearings on the stock rod! lol.

I personally use these rods: SFJ10-500 the have a HRC of 58 plenty hard enough for bearings.

tmoore
Posts: 45
Joined: Tue Jan 28, 2014 1:03 am

Re: TAZ Very loose Solid rod bearings?

Post by tmoore » Sat Mar 08, 2014 11:01 pm

Exactly. That's why the plastic bearings work here. If I were to upgrade to steel bearings a rod upgrade would be an imperative.

ross_badger
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Joined: Thu Oct 10, 2013 4:44 am

Re: TAZ Very loose Solid rod bearings?

Post by ross_badger » Wed Mar 26, 2014 4:41 am

Alup wrote:I have created a new bearing holder for the Taz that might solve this issue. I am still testing it but seems good so far. Check it out and let me know if i need to make any modifications to it.

It uses the Misumi part SHBZ10-25 for the bushing.

http://www.thingiverse.com/thing:263630
Any update on the solid bushing and holders? To me, this looks promising to solve both the looseness issue and to quiet the movement.

I've just ordered harder 10mm rods from Misumi, PSFU10-500, as well as linear bearings, LMU10, and the solid bushings to try, SHBZ10-25.

BTW, Misumi has a promotion going on now for first time web credit card buyers......if you put in "First150--Reddit" in the promotion code area, they will take $150 off your order! There doesn't seem to be any restrictions......i.e., you order $150 worth of stuff, you only pay shipping.

Ross

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RevolutionDesignFX
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Re: TAZ Very loose Solid rod bearings?

Post by RevolutionDesignFX » Sat Mar 29, 2014 9:27 am

Hi Ross! looking to buy the same components myself and give it a makeover, mine is also loose and i can't seem to print anything fast without noticeable resonance issues. I am stuck trying to find the different rod sizes needed, namely the lengths of the x and y rods. would you mind pointing me to this information? thank you so much!

ross_badger
Posts: 34
Joined: Thu Oct 10, 2013 4:44 am

Re: TAZ Very loose Solid rod bearings?

Post by ross_badger » Sun Mar 30, 2014 4:46 am

This is what I ordered from Misumi:

PSFU10-500 52100 Chrome rods @ 58 HRc hardness --> http://us.misumi-ec.com/vona2/result/?K ... PSFU10-500

LMU10 Linear Bearings --> http://us.misumi-ec.com/vona2/result/?Keyword=LMU10

SHBZ10-25 Solid Bushings --> http://us.misumi-ec.com/vona2/result/?Keyword=SHBZ10-25

As an update, I printed off the solid bushing holders ( http://www.thingiverse.com/thing:263630 ), and the solid bushings fit well. However, I found that I wasn't able to use them because I wasn't able to get the alignment perfect. Using two solid bushings on the same rod requires perfect alignment, otherwise they bind up on the rod. I'm not sure if it would help to redesign the holders to have the slot in the round portion to allow the bushing to "float" just a little bit......just like the stock holders. At the moment, I'm going back to the noisier linear bearings :-(

Ross

ross_badger
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Joined: Thu Oct 10, 2013 4:44 am

Re: TAZ Very loose Solid rod bearings?

Post by ross_badger » Mon Mar 31, 2014 4:52 am

An update: I replaced the soft stainless steel stock rods with the hard 52100 chrome rods, and upgraded the linear bearings with the Misumi ones. I was pleasantly surprised at how quiet this set-up is. No more squealing or resonance problems. I did see on the removed stock rods that there were many indents and score lines, due to the very hard ball bearings. I'm sure this is what was causing the very loud squealing.

Now the loudest part is the stepper motors, and I'm not sure what we can do about those :-)

So far I am happy with the lack of bearing/rod play and the low noise level!

Ross

Alup
Posts: 8
Joined: Wed Mar 05, 2014 11:29 pm

Re: TAZ Very loose Solid rod bearings?

Post by Alup » Tue Apr 08, 2014 2:10 am

ross_badger wrote:This is what I ordered from Misumi:

PSFU10-500 52100 Chrome rods @ 58 HRc hardness --> http://us.misumi-ec.com/vona2/result/?K ... PSFU10-500

LMU10 Linear Bearings --> http://us.misumi-ec.com/vona2/result/?Keyword=LMU10

SHBZ10-25 Solid Bushings --> http://us.misumi-ec.com/vona2/result/?Keyword=SHBZ10-25

As an update, I printed off the solid bushing holders ( http://www.thingiverse.com/thing:263630 ), and the solid bushings fit well. However, I found that I wasn't able to use them because I wasn't able to get the alignment perfect. Using two solid bushings on the same rod requires perfect alignment, otherwise they bind up on the rod. I'm not sure if it would help to redesign the holders to have the slot in the round portion to allow the bushing to "float" just a little bit......just like the stock holders. At the moment, I'm going back to the noisier linear bearings :-(

Ross
Ross,
I have updated the Single Bearing holder with a split at the top. Please let me know if that works better. On my printer I just used a piece of metal as a guide for the bearings to align them. I do believe that the break in the top may solve the absolute precision of it and allow for easier installation. If the single bearing holder works well for you then I will make the double one as well. Please let me know.

EDIT: I just went ahead and made the Double Bearing holder with a split in the top. You can get both on the Thingiverse page: http://www.thingiverse.com/thing:263630

ross_badger
Posts: 34
Joined: Thu Oct 10, 2013 4:44 am

Re: TAZ Very loose Solid rod bearings?

Post by ross_badger » Tue Apr 08, 2014 7:33 pm

Thanks very much!

I will try them, but maybe not very soon. Before I saw this thread, I was using the stock stainless rods with cheap bearings, and they squealed quite a bit. I then started using the much harder 52100 chrome rods with better bearings from Misumi, and it is day and night. No more slop and play and the only noise is from the stepper motors. Hopefully it stays this way......if not, then I'm going to try the solid bearings with your updated holders with the split.

Are you not having any issues with binding?

thanks, Ross

wentbackward
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Joined: Thu May 29, 2014 9:35 am

Re: TAZ Very loose Solid rod bearings?

Post by wentbackward » Thu May 29, 2014 11:52 am

Thanks for all the pointers chaps, I'm having the same problems. Lots of slop, everything goes out of alignment on every print, hard to line up the Z axis as it move about so much.

Also when my machine turned up the table and fixture fell apart as the brass set-screw holders that hold the rods in have been mounted in a way that makes the hole too big. I emailed lulzbot sales and was ignored.

*Sigh* will visit my local bearing firm on Sat morning to see what they have.

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Orias
Aleph Objects | LulzBot
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Re: TAZ Very loose Solid rod bearings?

Post by Orias » Thu May 29, 2014 12:08 pm

I'm sorry to hear that the brass heat-set inserts on the Y axis wasn't secure. That's doesn't happen often. Is it currently secure? If not, contact our support team at support@lulzbot.com as it will come directly to us to minimize any potential delays. We work rather diligently on making sure that every contact is responded to within one business day, so we apologize if your message was missed. I've found the thread from earlier this month and will have more information for you shortly.

Before you replace anything, how well is the Y axis smooth rod secured in it's housing?

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